Improvement in screw-cutters



M. M. YOUNG.

Screw Cutter. him-55,571. Patented June 12, 1866 il Efnwu. frzveniar;

(1. MM JZZZ N. PEY

UNITED STATES PATENT OFFICE.

IMPROVEMENT IN SCREW-CUTTERS.

Specification forming part of Letters Patent No. 55,571, dated June 12,1866.

To all whom it may concern:

Be it known that I, MOSES M. YOUNG, of Chelsea, in the county of Suffolkand State of Massachusetts, have invented an Improved Screw-Cutter; andI dohereby declare the same to be fully described in the followingspecification and represented in the accompanying drawings, of which-Figure 1 is a top view, Fig. 2 a side elevation, Fig. 3 a longitudinalsection, and Fig. 4 a transverse section, of it. v

The principal parts of the said screw-cutter area stock or die-holder,A, a die, B, and a tubular guid 0.

The die B is to be constructed of steel, and with alnouth a, extendingthrough it, and provided with a series of screw cutters or chasers, I) bI), each of which has a chip-throat or recess, 0, arranged in advance ofit.

The stock is to be made with a socket,f, to receive the die, which, whenin place in the socket, as represented in the drawings, rests on ledgesd d, projecting from and arranged with respect to the sides of thesocket in manner as shown in Figs. 3 and 4. Furthermore, the stock isformed at each end with a female screw, 6, to receive one of twohandles, g g, which are to project from the stock and serve as means bywhich it may be revolved by a workman.

The guide 0 is a tube provided with two feet, h h, arranged so as toproject below and from its lower end. These feet are to rest on and befastened to the die B by means of screws 2' i, the same being to soraise the guidetube from the die as to leave apertures 70 it between itand the die, such apertures bein g for facilitating-the discharge of theshavings made by the cutters in order that they may not get intotheguide and clog it While the implement may be in use. The die is kept inplace in the socket of the stock by means of two slides, l I, held tothe stock by screws m m, which, after going through slots in the slides,are screwed into the stock. By drawing the slides back from over the diethe latter may be removed from the socket.

1 am aware that a pipe-screw-cutting imple-. ment has been made with apipe-guide socket to extend directly from its stock instead of beingfastened to the die, as is the pipe-guide of my improved implement. Insuch case a separatepipe-guide for each die of a set has its reception.When the pipeguides are thus.

separated from their dies they are very apt to become lost or misplaced;but by having each guide fastened directly to and projecting from itsdie, the two are. not only always kept together, but when once properlyarranged the guide will operate to centralize a pipe with respect to thecutters to better advantage than when it is projected from the stock,for when the guide extends from the stock the die-plate can play or movewithin its socket independently of the guide; but when the two areconnected together any movement of one will be accompanied by acorresponding movement of the other. Thus it will be seen that with theguide fastened to the die the formation of a screw on a pipe, wheninserted in the guide, is likely to be accomplished with more certaintyof it being concentric with the axis of the pipe than when the guide issupported by the stock and is separate from the die.

I make no claim to the pipe screw-cutter. as described in the UnitedStates Patent No. 39,988, my invention being an improvement withreference thereto.

By my improved construction of the pipe screw-cutter the die is soapplied to the stock and the centralizer or guide is so applied directlyto the die that the die and centralizer can be removed together from thestock without the necessity of separating such centralizer from the die.This isan advantage not possessed by the pipe-cutter described in thesaid Patent No. 39,988.

I therefore claim- 1. The improved arrangement of the guide 0, or itsapplication directly to the die B, and so as to project therefrom, asspecified, in com bination with the application of the die to the stock,so as to enable the two to be separated without the necessity of firstdetaching the guide or centralizer from the die.

2. The combination and arran gem ent of chipdischarging passages k kwith the guide and the die applied together, as set forth.

' M. M. YOUNG.

Witnesses:

G. H. WASHBURN, F. P. HALE, Jr.

